Sorry to hear it won't run on your PC. The movie was taken on my Sony Ericson Smart phone. It runs ok on my computer and my wife's computer.

The movie clip shows what appears to be a Winter Crane Fly on the ceiling. Its feet are gripping the surface of the ceiling but its body is bouncing up and down really fast, about 6-7 times a second. At no time do any of its feet lose contact with the surface. I wondered what would cause it to behave like this.

According to this video it is vibrating to spread its pheromones. To me that sounds reasonable, even if I can't find any references to it, as many other insects do similar things (for instance moths vibrating their wings).

And it worked with quick-time (which I had to reinstall - as I had a crash a while ago...).

It worked for me -- clicked on it, it came up with a window asking you to play or save, I clicked play using the suggested default (QuickTime Player), and it came up with a large window, which you then have to click Play to activate. A few steps, but it worked... no ideas about your winter cranefly though.